No.
Remember how when the first MacBook Pro was just introduced? It was a 15", and at the time the 12" and 17" PowerBooks were still being sold... Same story here, First the 15" is introduced, then a month or two later the 17" will be.
Yeah! and when the aluminum 12" and 17" Powerbooks were announced it was several months before the 15" was announced. The reason being the last generation 15" Tibookd models were introduced a few months before the first aluminums came out. I think they were fearful of pissing off folks who had just bought them.
Who knows why Apple does what they do sometimes. I really hope a lot of the rumors we've heard here are not true. Glossy displays only on MBP's is just WRONG! Glossy on the surface look cool but are a hinderance for people doing serious color work. I also find they smudge much easier and our difficult to clean - more so than matter screens. I know they can't please everybody but I think these can become serious strategic blunders.