I am not sure that announcing a tie-up by Global Foundry with LWLG is a hugely significant pre-IPO benefit to GF. LWLG gains the most with the validation of their technology with a foundry in tHE PDK approach. For Global Foundry it is just publicly playing their hand, and I feel they will surely determine the best timing - I hope it is very soon.
I am not an industry veteran here so my opinion is nowhere near worth 2 cents - has no value at all...but I have enough skin in the game to enjoy chatting.