There are honestly so many options. It all depends on how desperate they get. I could really seem them doing another donation slip except asking you to link your card so it's pulled monthly. You can already do that on JW.orgbut I feel this could be something that once you agree, they add it to JW.org and it's tracked.
Anecdotal evidence is anecdotal, but the last CO visit I attended (about 7 months back) he was pushing this feature of JW.org. "It just makes everything so much easier! You never have to wonder 'Did I donate yet this month?' - it's all done for you automatically!" When you stop and think that this is being said by a guy who doesn't actually donate money to the cult it becomes somewhat comical that he was saying it like it was some big stressor in his life.
Another thought - the auto-donate doesn't actually give you a way to donate money to the local KH, does it? It seems to me that they're trying to make it easier to donate to "mother" but let more and more forget to donate to the local expenses, thereby off-loading the begging for money onto the local elders. Then when there's a local needs talk about needing money, it will be about local expenses and all the good little JWs will say "Well I don't like that they're asking for money, but that's just the local congregation - the organization as a whole is still good and doesn't solicit money like christendom"