I'm thinking they will do a silent spec bump on the New iPad with the iPad Mini announcement. I don't know if it will be heavily covered during the Mini announcement though if it happens as they say in a couple of weeks.
A6 is big improvement over A5X - so if it is covered, it will be covered heavily.
but question whether they can risk the production?
if the new iPad updated, then you have four new product in demand, iPhone 5, iPod touch, iPad mini and iPad - that is too much to meed the demand.
in the holiday quarter missed sale is missed opportunity