This would, from what I have gathered from reading the many, many posts in this thread, mean that Apple would have to care about being the best with the latest tech, which is not what Apple are about... at least with the MBP. If they were:
1. We would have already had an update of the 15" last year to Broadwell
2. Previous iterations of the MBP would have had better dGPUs.
It seems that there are a number of people who want gaming performance and thus want Apple to wait until the new GPUs are released... but Apple don't make the MBP for gamers. they make them for business/professional users. So, unless there is going to be a huge about face from Apple in how they design and market their machines, I can't see them waiting until June just for a better GPU. Especially as they are already so far behind the competition with the current line up.