Markoz wrote on Jan 17^th, 2019 at 7:14am:

The good news. You might be entitled to a free upgrade to the 777 Captain for P3Dv4 when it arrives,

I highly doubt this, CS allowed no such upgrade path with the 757, even if you wanted to update to the 32 bit version they still charged roughly 90 percent of the price of the 64 bit version.  I doubt CS will ever release anything again without finding a way to charge for it.  Not complaining, I purchase what I decide to purchase in the end, but I really have zero confidence that CS will ever put out a free upgrade again. If they wanted to port the other AC over, they would have done so by now.