If they do switch to the drop floor, will it make the raft faster? Is it any faster with the bigger tubes since it probably doesn't sit as low in the water?
I recently got a new boat and did a ton of research, the RMR of course was appealing due to cost, I did not get to row one but did spend a bunch of time at a retailer going over several and found one design feature I didn't like that I thought would translate to a lot more drag on the water. I'm primarily a fisherman and wanted a boat that would back row well (that is be able to hold in current with minimal effort). I was replacing an old hyside that was very difficult to backrow and depending on your point of view was really fast or really slow. I say this because most buzzards are whitewater folks and fast to them is grabing available current and moving quickly and easily down
stream. I had a long series of chat's with numerous folks about boat speed and found out that boat speed in conversation is purely a matter of perspective. The point of this is if your looking at a fishing boat you need to remember that a fast boat to a whitewater boater is probably going to be a slow boat for you (or difficult to backrow a fisherman).
What didn't I like about the RMR design, it has a really long straight section that ends in an abrubt (visual estimate near 45 degree) transition into bow and stern sections. I thought this design would translate into the boat pushing a lot more water when backrowing (like rowing a rowboat transom first). I found a design more to my liking and am happy with it, and I did not ever get the chance to row the RMR so it's all theory on my part. I think they're great boats and if they had more of a constant curve (or longer rocker, or longer transition from straight section to bow/stern) I would have bought one. I'm guessing this design element is minor to most folks but somebody looking at a fishing boat that will be rowing several of their free loading friends down countless river miles might appreciate less drag.
long story short, I think speed is a matter of perspective and the transition design of the RMR's I saw would appear to promote drag, thus making a slower boat from my perspective. But I'm probably in the minority with this perspective.