The only changes I notice in looking at this excerpt from the 2014 GT which I bought on December 30, 2014, is a change in the blue colour offered from Sky Blue Mica to Blue Reflex Mica and a modest MSRP increase of $50 (from $33,250.00 then to $33,300.00 now).
This does not portend well for those hoping for significant changes/upgrades for the 2015 models; here in Canada, anyways. So much for the rumoured head unit change.
In hindsight, I'm glad that I didn't hold off and wait to order the 2015 as I was considering. I was hoping for a new head unit to correct the known USB music playback and phone contact list and texting issues. I think that I negotiated a great price and even had an Ipad Air thrown in as a part of Mazda's December promotion.
Now, I just have to get the vehicle. I'm picking it up tomorrow afternoon.