I tried 4e, played three campaigns, but it wasn't really my thing for many reasons I won't go in to. I'm interested in 5e, and a few friends of mine are also interested, so if it it an open playtest type deal like they say, we'll be giving it a try.
Thing is though, I'm not sure what they hope to achieve with 5e. From what I can tell, 4e fans like the 4e style of play, and fans of 3e like 3e and either still play that or play Pathfinder. Some have said they hope to bring back players who preferred the older systems, but I'm not sure if they can do that without a compromise no one is happy with. I don't know, we will see. I will give it a try and draw my conclusions then.