If Gingerbread really is all about introducing a revamped UI there's no way this is anything but Vanilla Android. I do expect them to lock up the bootloader. As a prior Milestone user I won't be buying another Moto product, but I do hope it's good.
On a side note, I really hope that the G2 and this phone are the start of a new wave of Vanilla Android devices. I'm really worried about the fate of Android when the user experience varies so much and depends a lot on manufacturers and carriers.