Update:

> I wonder if Freescale will implement AltiVec in QorIQ
> a) as a sub-unit of e500/e5500 core (like with e600) and thus create new core(s) or
> b) as a coprocessor unit to e500/e5500 core or
> c) simply by taking e600 core and continuing its development (i.e. e600 based QorIQ) ;-)

Freescale decided for option 'a' according to this:

"According to Freescale, AltiVec requires about as much die area as a data cache. As processors integrate more features, the portion of a die used by the CPUs is diminishing. Thus, the cost of adding AltiVec is fairly minimal, even when multiplied by several CPU cores. Once Freescale implements AltiVec into its CPU cores, we expect the company to offer it in all five tiers of the QorIQ family."
http://www.linleygroup.com/Newsletters/LinleyWire/wire101001.html#3

And according to this it seems that it will be members of the recent QorIQ P series that will get AltiVec (not just the future QorIQ T series as I suspected as a possibility at first).