Yeah, I'm worried about that as well. ND is likely tied up with UC4 - will they have resources to spare for this project?Obviously an E3 announcement.
All I want is 1080p/60fps.
Considering ND had to bust their asses to achieve that for TLOU, I'm semi hopeful.
That said, the Uncharted games all ran much better on PS3 than The Last of Us did suggesting less demanding games overall. Hopefully work that was done on The Last of Us will make this project easier to pull off.