Billi:
I looked at the 622 but as it is fairly expensive for a 6", with rather less than cutting-edge technology (Pearl-600x800 & Capacitive touchscreen have both been out for a year or more), which shouldn't command any price premium, so I couldn't see the point in paying over the odds for it as an upgrade. To put it another way: if the 622 is my best buy, then my best decision is to wait.
(Another factor compounding the downside of the 622 is that virtually nobody sells it. The only place I could find selling it, on a brief check to confirm my price impression, was Amazon UK's Marketplace. None of the main online Pocketbook stores seem to stock it -- they're still selling 612s for around US$200.)
frostschutz:
You're missing the major selling point of the Wexler -- it is
half 
the weight of the i62HD. That aspect doesn't make it a 'must-buy' for me, but it
does keep it in the running (as I'd put approximately equal weighting on that aspect as presence/lack of a touchscreen).
(Parenthetically, the main reason I would prefer a touchscreen is for Pratchett's Diskworld novels -- he puts many of his jokes into footnotes, which aren't navigable without a touchscreen. If a an eReader was able to navigate to/back-from without a touchscreen, e.g. by DPad and/or buttons, it would render the touchscreen largely superfluous.)