How well does the A99 work for sports photography

Luckily I haven't spent too much on the a55 lenses.  But I was considering buying the newly rumored successor of the 70-200mm f2.8 lens and that led me to really consider what system I need to invest in.

Seeing that I may have 1 or 2 primes that may work with the a99 full frame sensor I don't feel like it will be a big loss for me to jump brands if I do decide another full frame camera would work better.

I guess I figure I'm going to have to buy a whole new lens system anyways so I'm prepared to slowly start all over again.  Now it just a matter of seeing what is out there.

I plan to visit my local camera shop today and get my hands on all three and maybe drive the salesperson a bit crazy with my questions but I figure if I'm going to be spending $5000+ for a body and lens, I'd better get some play time in.

I was going to go with the Nikon d600 but the sensor dirt issue is a big concern for me.  Maybe once I start seeing that it has been resolved I'll consider that one again.