I've realized I have a bad back and too much stuff to carry on my outings with small children and all, that the idea of a lighter camera is very appealing, even with the compromises involved.
So I'm seriously considering something like a GF1/EP-1 for landscape photography while hiking and street photography during my business travels (where showing up at a customer's with a DSLR might be frowned upon). And perhaps everything else (photos of my children mostly indoors) as I cannot really afford to run two systems in parallel - my Pentax system is extremely modest now so I'm in a different boat than most of you on that.
I think I can live with worse high-ISO performance and an EVF/lack of a viewfinder. Probably even with lack of WR if it comes with a small size.
However, I'm concerned about the nearly non-existent grips on GF1/EP-1 (and allegedly at least GF1 is quite slippery), and they don't have articulated screens. G1/GH1 are better in this regard but then also take up way too much space so I might as well buy a K-x then. Then there's the choice between poor AF + no kit 20mm (EP-1) and no-IBIS (GF1).
Also, the only UWA option for m43 is the Pana 7-14 for gbp 900 (incidentally, the same as Pentax 12-24). There are some other UWA lenses coming out this year though.
I don't need to upgrade until the next summer vacation so I'm sitting on the fence and hoping Pentax comes out with a (WR!?) EVIL camera, though I think the chances are slim.
A semi-related thread I started comparing the different options I personally have:
https://www.pentaxforums.com/forums/pentax-dslr-discussion/86172-system-compa...resistant.html
Does this make sense to anyone?