I personally believe speaking in tongues, prophesying, and any diving knowledge beyond what has been provided in the Bible has ceased:
(1 Corinthians 13:8-12) 8 Love never fails. But whether there are [gifts of] prophesying, they will be done away with; whether there are tongues, they will cease; whether there is knowledge, it will be done away with. 9 For we have partial knowledge and we prophesy partially; 10 but when that which is complete arrives, that which is partial will be done away with. 11 When I was a babe, I used to speak as a babe, to think as a babe, to reason as a babe; but now that I have become a man, I have done away with the [traits] of a babe. 12 For at present we see in hazy outline by means of a metal mirror, but then it will be face to face. At present I know partially, but then I shall know accurately even as I am accurately known. (NWT)
So, I don't think there are any "true prophets" today that make new prophecies beyond what the Bible has provided or tries to pinpoint specific predictions that strain the credibility based on the highly symbolic prophecies provided in the Bible, or by tying together a number of prophecies and calculations to make a unique application to our day.
More than a few Christian groups thoroughout history have tried to guess what a prophecy means, make up a "second fulfillment", or try to make it fit modern day events (an occurence among different Christian religions it seems, I remember a Christian studen''ts report in high school applying a prophecy in Isaiah where "arrows" were a prophesy of "rockets" in the Middle East conflicts.). In regards to the Watchtower Society, it seems that that after the 1975 incident, and with the change that the governing body must decide on any new or changes in official teachings, that we will not see any individuals guesses/predictions allowed to make it into official teachings. The organization now seems to be following the advice given that same year.:
*** w75 7/1 p. 389 Mideastern Events—Do They Fulfill Prophecy? ***
Of course, devoted servants of God are rightly concerned with what is happening in fulfillment of Bible prophecy. They are like the Hebrew prophets of ancient times who were keenly interested in the fulfillment of their spirit-inspired utterances about the Messiah or Christ. At 1 Peter 1:10, 11, we read: “A diligent inquiry and a careful search were made by the prophets who prophesied about the undeserved kindness meant for you. They kept on investigating what particular season or what sort of season the spirit in them was indicating concerning Christ when it was bearing witness beforehand about the sufferings for Christ and about the glories to follow these.”
However, we should not go beyond what a particular prophecy actually says. Bible prophecies cannot be understood in full detail until the events to which they point take place. So we do well not to speculate as to what certain happenings in the Middle East or elsewhere may or may not mean.
Such speculation can lead to one’s becoming off balance and deeply involved with matters that actually have little or nothing to do with the building up of faith. A person might also spend much time that could otherwise be used far more profitably in gaining spiritual strength
Incidentally, after Rutherford's prediction for 1925 did not come to pass, he admitted :
*** w84 10/1 p. 24 ‘Jehovah Has Dealt Rewardingly With Me’ ***
Regarding his misguided statements as to what we could expect in 1925, he once confessed to us at Bethel, “I made an ass of myself.”
Rutherford seemed to have learned from this incident and although there were some other suggestions in regards to dates, he never again made one officially so strongly as the one he did for 1925. The 1975 excitement came up after Rutherford has passed away and the vice-president, Fred Franz, had speculated that it would be extremely fitting for Armageddon to come after 6000 years of man's existence, which he calculated to be 1975. A bit of wiggle room was added by saying that the 6000 years would be measured from when Eve was created (not Adam), but then this teaching was abandoned soon after. So, no Fred never said that it "will" come, but since it was coming from the Faithful Slave, it was taken by many JWs and Society representaives as are more than just a "maybe".
The next preditions coming up are the Christian groups that say Jesus MIGHT be coming on dates this years such as May 14 2011 ( http://www.jonathanselby.com/May14,2011.html ), or May 21, 2011. I have seen billboards advertising this date. Of course, by saying "MIGHT", they have provided the technicality they need to say that they never said it was a certainty.
When it comes down to it, the Apostle John (written after 70CE) thought the end was near, all Christian groups in the past 2000 years applied prophecies to their own times and felt the end was near. Conclusion? Take Jesus advice: (Matthew 24:42) "Keep on the watch, therefore, because YOU do not know on what day YOUR Lord is coming." Whether the end is coming tomorrow or not in our lifeteime, that time element should not be an important factor in our Christian faith. Not knowing when the end is coming should keep a Christian just as watchful, if not more, than if they knew the date.