I believe it's already possible to hook up and external card to a Pro. At least I've seen pictures of it on a gamers machine so don't know how viable it actually is
It's not officially supported and so probably isn't a good business investment.
The Razer Core is (I believe?) the first non-chinese/ebay/type-thing solution that is officially meant to work on laptops (other than Razer or whoever makes the eGPU dock).
However I read a thread today saying someone who has one of these couldn't get it to work with the new 13" MBP. Don't know if that means it won't be possible in the future though. It's also very expensive ($400?) to add on top of the GPU.
The Razer Core is (I believe?) the first non-chinese/ebay/type-thing solution that is officially meant to work on laptops (other than Razer or whoever makes the eGPU dock).
However I read a thread today saying someone who has one of these couldn't get it to work with the new 13" MBP. Don't know if that means it won't be possible in the future though. It's also very expensive ($400?) to add on top of the GPU.