I checked here to see if anyone was playtesting Next and was suprised to find no-one was (or at least there are no open games at the moment) have people been testing it out or is there some reason people aren't?

Actually, there are nine* games of D&DNext running on the weave, only two of which are private.

*or more, but only those are listed as D&D 5Ed.

I'm in one. There are just few people running games, its also somewhat complicated without a sheet. Is that something that's in the works?

Probably not. Sheet development takes time & is done by volunteers. I doubt anyone would want to take the time for a product that's barely out of alpha testing.