All the better, my Broadwell 13 inch MacBook Pro can remain the latest and greatest a little longer. 😉
Does it even matter though? The niche crowd who upgrades to the latest and greatest every year are just that, a niche. There are probably persons still getting enough value out of their Macs from 2010. I know a graphics designer who was using 233 iMac G3's with 160 MBs of RAM, OS X Panther, Photoshop CS and Illustrator CS back in 2007 to do freelance work and making really good money out of it.
For many, having the fastest is about who can have the bigger D. The 2015 Retina MacBook is honestly not a game changer or must have and its one of things Steve Jobs preached in 2005. Its not about clock cycle, but performance per watt. We have all forgotten and kinda fallen into trap of measuring innovation based on CPU speed.
Does the 2012 Retina MacBook Pro look any different from the 2014 Retina MacBook Pro? No. Sure, one might be a little bit more powerful, but I am sure you can accomplish the same work you did in 2012 in 2015 just the same.
Does it require more processing powerful for post production of a show like Scandal, Suits or House of Cards? Does it require any more powerful GPUs to create artwork going on a T-Shirt or business card?