We have no further details. Especially on models that will move among the big iMac or on the presence or absence of an overhaul of their external keyboards, on the model of the MacBook.
The site notes that shipping estimates for the high end MacBook Pro are currently 2-3 weeks and low-end models with bumped processors ship in 1-2 weeks.
The iMac currently ships within a few days unless the graphics card on the high-end (non-Retina) model is bumped to a GTX 780m which results in a shipping time of 2-3 weeks.
It's likely that if updated, the 15-inch MacBook Pro would get a Force Touch trackpad, just like the 13-inch which was updated back in March.
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Read More [via Yohann]