The SR-22, basically a 10/22 with an AR-15 dress kit....from Ruger. Nothing really AR-15 about it. 10 round mags, 10/22 functionality, only a collapsible stock and tube forearm for about $500ish in stores....don't remember when it's coming out, but for those who REALLY REALLY want a dressed up 10/22 then this is for you....if your looking for a .22LR AR option then check out the S&W M&P15-22, full AR controls, sights, rails, 25 capacity mag(s). For about the same price. Colt makes one too for about $100 more than the S&W option.
I personally like the S&W option better, have fondled it, I liked it more than the Colt option. Both had plastic bits on the receivers, but honestly for a .22, an all metal design isn't needed, it does have steel inside the plastic for support/frame work but not the shell. A coworker has the S&W on layaway at the LGS, will know how it shoots after I recover first hand .
And I don't know a darn thing about a potential SR9-22 PISTOL, only the SR-22 RIFLE. AFAIK, nothing to support this first rumor.
I'm talking about a pistol not the SR22 rifle. It looks like a cross between the SR9 and a Mark I. I can't post the photo here, some sites are easy this one isn't, but if someone would send me their email address in a PM, I'll email you the photo and perhaps you could post it for me. It's a very cool looking pistol.
The only thing I can think of since you say a cross of the SR9 and MKI pistols is the MKIII 22/45. Anything Googled about Ruger SR9-22 is just that the SR9 has 22 lpi (lines per inch) checkering on it's grip.