I think it means that we've only committed to Tranche 1 and Tranche 2 so far - invested in 144 and still to sign for the 88 in Tranche 3 - so it'll include FGR4s (and T3s) as well as the T1/F2.
Harrogate - the journalist probably has the briefing notes that say that there'll be three Typhoon bases, rather than the latest info that refers only to two. That said, you can find quite a bit of speculation around these means suggesting that Leeming will get Typhoons, so perhaps the journo reads Pprune...