Walt Disney World moving security screening to Transportation and Ticket Center

This makes a ton more sense, as screening at the park gate is a currently a mess. However, does this mean they'll also be screening people coming off of the buses, and at the monorail resorts before they get on the boats or monorail?

That was my very question, too.
When we were there in February the security checks weren't too bad, but usually three of us were bag free. And sometimes in the evening they weren't there at all, which seemed strange to me as at that time of day there's another influx of visitors due to night time shows, etc.
The MK monorail station was undergoing some kind of construction, so maybe it will happen there somewhere, if at all.
I'll assume the other gates will still be handled as is, I can't think of another solution, but I thought the worst security backup happened at EPCOT.

Jeff said:

However, does this mean they'll also be screening people coming off of the buses, and at the monorail resorts before they get on the boats or monorail?

I vaguely recall reading that the bus folks will be screened after being dropped off, which makes sense b/c there's no way to easily control access to the buses at most resorts given how the stops are arranged. I also vaguely recall that Resort monorail guests will be screened on the platforms at the resorts. All of this could be wrong.

The last two times I went to Epcot, they passed everyone through the magnetometers, which was not the case before Christmas. Mind you, it's all pretty efficient, especially if you don't have a bag.

This makes a lot of sense and will make things more consistent. At EPCOT to get to the monorail you are in the screened area already, but if you come over on the monorail, you end up being rescreened. At the magic kingdom, you are not screened until after the monorail, and in reality, I don't know if there is truly enough space to expand screening. All in all, screening at all of the parks earlier this month was somewhat messy with, in our case, a stroller. And what was very interesting was having the bag check completely separate from the magnetometers.

It's a shame that there needs to be this level of security, but I'm not surprised at the need.
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On a tangentially related note, DL moved their security screening to pre-Downtown Disney rather than at the entrance to the plaza (2 years ago, the last time I visited). It took us about 10 minutes to get through it one morning when we walked right through it last trip. I don't know if these are related or if crowds were a bigger factor.