On the contrary, now with the news that Apple switched some of the OS X team to iPhone OS development, which will delay 10.7, we'll probably see a Tiger like cycle on 10.6, over 2 years. So it will go well beyond 10.6.6.
Steve Jobs responded to this with an email. It seems OS X has not been 'pushed' back.
And even if Jobs didn't directly respond to the claims, the "news" was mere speculative if I recall. Hardly confirmed.
Ha, oh yea, I'm at a rumor site. This all makes sense now