Screen size for sure; at least it'll be on par with the fruit phone in that respect.
The processor is also a big thing for me. I have a minus that's OC'd, and still it seems like it laggs from time to time.
Camera...well, I think the front facing camera to be something to look forward to; mainly b/c we'll now have video chat.
I'm looking forward also to the touch to share technology. I know it's something that will initially work with the TouchPad, but I can see a future that will open up many possibilites for this.
In closing, I'm really just looking forward to a new webOS phone. I do love my minus, but after nearly 2 years, it's time for an upgrade; not just in software, but in hardware as well.
Just my 2¢....