The price points for the new Power of the Primes toyline have been found in a US ToysRUs store computer, and some of the size classes look like they might have gone up in price from Titans Return.
(currently on the US TRU website, TR Voyagers are $25, but POTP Voyagers are $30)

Tra gen prime master – 140306 – $5.99
Tra gen prime legends -140055 – $9.99
Tra gen prime deluxe – 140454 – $16.99
Tra gen prime voyager – 140713 – $29.99
Tra gen prime leader – 139944 – $49.99
Aside from the Voyagers being $5 more, the Titans Return had Titanmasters at $5, so these ones are up by a dollar... which could mean that the "pretender shells" are larger than the Titanmaster vehicles.
The other three size classes are the same as the TR RRPs, so this could mean that Voyagers could see a price rise here as well.

They also found a number of new Transformers listings, some of which are unknown at this time...

(these could be related to Nerf)
Tra energon ignitrs nitro – 140788 – $19.99
Tra energon ignitrs pwr-140950 – $9.99
Tra energon ignitrs spd – 141140 – $5.99

A segment of the tiny turbo changers line separate from TLK
Tra tiny turbo changers – 141183 – $2.99

And lastly some unknown exclusives
Ex tra Optimus starscream set – 141434 – $24.99
Ex tra street racer – 141450 – $16.99