Interestingly enough, it's unknown whether or not AT&T's update for webOS 1.4.5 will follow similarly to the one Verizon is putting out. However, the situation is even stranger as it appears as though there is no mention about improved battery life and better Mobile HotSpot functionality with Windows Vista 64-bit on Palm's release notes for Verizon's webOS 1.4.5 update. We'll have to wait and see what kind of enhancements or other items are included with either updates from Palm.
Palm Pre Plus Specifications | Review (Verizon)
Palm Pre Plus Specifications | Review (AT&T)