It's too early to say for sure, I think we'll have a better idea after iFixit does a teardown. I'd say it's pretty likely, but another issue is that we'll need at least the Verizon 2.0 webOS doctor and the modifications to it for it go on Sprint's network... I wouldn't expect it day 1 of the Pre 2 release, but hopefully soon after!
If the internals are similar enough, and that's a fairly substantial if, and if the software can be made to deal with it, then maybe it could be done, just like the Pre plus on Sprint. Gotta wait for more specs or the iFixit teardown before we have any clue.