This is what the WT July 15 has to say...
18 In view of the foregoing, what can we conclude? When Jesus comes for judgment during the great tribulation, he will find that the faithful slave has been loyally dispensing timely spiritual food to the domestics. Jesus will then delight in making the second appointment—over all his belongings. Those who make up the faithful slave will get this appointment when they receive their heavenly reward, becoming corulers with Christ.
19 Does the faithful slave receive a greater reward in heaven than the rest of the anointed? No. A reward promised to a small group in one setting may ultimately be shared by others. For example, consider what Jesus said to his 11 faithful apostles the night before he died. (ReadLuke 22:28-30.) Jesus promised that small group of men that a fine reward awaited them for their faithfulness. They would share his throne of kingly authority. But years later, he indicated that all of the 144,000 will sit on thrones and share his rulership. (Rev. 1:1; 3:21) Similarly, as stated at Matthew 24:47, he promised that a small group of men—the anointed brothers who make up the faithful slave—will be appointed over all his belongings. In reality, all of the 144,000 will share his vast heavenly authority.—Rev. 20:4, 6.
20 By means of the faithful and discreet slave, Jesus is following the pattern he set in the first century—feeding many through the hands of a few. Jesus appointed that faithful slave to ensure that his genuine followers—whether of the anointed or of the other sheep—would have a steady supply of timely spiritual food throughout the last days. Let us be determined to show our appreciation by giving our loyal support to the anointed brothers who make up that faithful and discreet slave.—Heb. 13:7, 17.
So the 144,000 are the F&DS in heaven. A few key points...
1 - There will be a rapture just before the final part of the big A
2 - The marriage of the lamb to the 144,000 will then take place
3 - The appointment over the belongings is in heaven. I am not sure however if this is before or after the marriage to the lamb.
Of course this is all irelevant since (a) it'a all a load of bollocks and (b) the WTS can change it's mind at any time.