I am thinking we won't see a new MBP with Vega Mobile or Coffee Lake or higher until July at the earliest. The current released Kaby Lake R 8th Gen Mobile CPUs still don't support LPDDR4 and are only quad cores. So far there is only a leaked stack which shows more 8th Gen Coffee Lake Mobile CPUs with 6 Cores but no other details and no time line for release. If Intel announces these at Computex in June. WWDC is the earliest time to see them.