I don't have a ton of information on BGW 2025, but last I heard, an RMC Hybrid concept- "Iron Drachen" as I've been jokingly referring to it myself- is what is happening. As for the Spire project, I have no clue to be completely honest. I know a concept like that was one of the concepts presented for a Giga in Tampa, but I'm fairly certain that's not what will ultimately end up happening in TPA (or VA, for that matter).
ETA: BGW 2025 should be RMC's IBOX model, similar to Iron Gwazi. I didn't say that in the initial message.