Here's a quick summary of covid-19 details as known for GGL/CCR.
The LHR CCR is closed, obviously this means the cabanas are also closed. The new current policy also is to only book a cabana 90 days in advance, and also note that no bookings are currently being accepted given the CCR closure.
The JFK CCR is also closed.
Covid-19 : BA network lounge closures, effective 17 March has a full list of BA lounge closures. Also most of the interesting OneWorld lounges (Flagship Lounges, Qantas first lounges, etc.) are currently closed
No update yet on whether or not BA will renew GGL or CCR or the GUFs at 2500/3500 tier points on either a prorated basis or on the basis of cancelled bookings, or whether they will extend jokers. GUFs and 241s are getting extensions upon request. Vouchers for canceled bookings do seem to preserve jokers/GUFs even past their original expiration date per my discussions with the GGL team (one perhaps actual benefit of accepting a voucher over a refund, though I imagine they will extend a joker for a cancellation given the current situation).