Yeah, a couple fill-ins and Luke's run would be the only really uncollected parts of WW v2 if they finish out the "... by WML" collections.
I'm wildly fascinated about DC's fits and starts in completing some volumes and not others. One would imagine if Flash: Savage Velocity sells well enough, they'll put out the next volume and get dangerously close to having the entire Wally West volume collected in pretty straightforward fashion, WWv2 is getting close (no idea if the Luke run would ever merit a collection - maybe if there is a third WW movie coming out and they need something new for the shelves). On the other side of things, Dixon's run on BoP doesn't look like it'll ever get finished, nor will his run on Robin.
I'm sure all of these things are mostly sales based, but that's also kind of interesting - Wonder Woman isn't a huge sales draw (she's not bad or anything, but not a top 10 main stay) and DC has shown less than stellar support for Wally West since Infinite Crisis, yet both of them have the right sized collections fan bases to complete full runs on the shelves while more popular characters like Batman and Superman (plus their sidekicks) have huge, huge gaps in their collections from the same time.