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I'm unsure what the USMC's plans are
USMC wants to upgrade all aircraft to Block 4 Lot 17 standard. I suspect that means that they will have some of the earlier aircraft left at 3F due to cost. This is probably good news for the RAF/FAA as the USMC will go first and 'prove' the upgrade path for F-35B, for the UK to deviate from that plan would bring in a lot of risk and expense. Essentially the USMC going for a high standard forces the UK MoD down that path as well, there appears to be only 1 UK F-35B that is in the 'really expensive' category for upgrades, and by the time this all happens it will have been in service for 20 years so will probably be left for tests, training or ground instructional.
The two largest buyers - USAF and International partners - would disagree. The former wants the upgraded performance and weapons that are promised with block 4, and the latter wants its own weapons integrated on the platform
With the demise of Turkey and the SOM-J missile the only international partner interested in weapons integration is the UK with Spear, Meteor, Asraam Block VI and Paveway Penetrator (and eventually FCASW and other Spear variants). JSM is US/Norwegian with Raytheon's involvement. There are rumours that Israel will look to integrate Spice 1000 and 2000, but they'll do that themselves (there are no other Israeli munitions that make sense to integrate at present).
No-one else has any stated plans whatsoever.