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The info and timeline is released: https://www.lotro.com/en/game/articles/world-transfers
In short, the server list (closing / remaining) will released next week. The actual move to the new datacenters (and Eu servers back to Eu) is 2-3 months later, more specific timeline will posted in Sept.
Only 10 servers remain from the 29... 5 US and 5 Eu. That's harsh. 1 Rp on both sides, so Landy is safe, on Eu side it's most likely Laurelin, but then the german rp folks will be pissed...
Character slots limit was increased with 16.2 last week, but won't be free if you transfer all the characters on one server.
Naming is mostly the same it was with the regular transfer, just got an "activity" filter with a 1 year period. So anyone log in at least once on the remaining servers will keep their names, and most transferring characters will end up with a -1. But everyone gets a title option with their former world name. Plus a cloak.
Kins get an easy mass-transfer option. Houses will be lost, Turbine is still looking the option for kinship neighborhoods (when a whole neighborhood was occupied by a kinship, most likely there won't be empty neighborhoods on the remaining servers for a kinship to purchase the houses on the same neighborhood again).
Friend list will be lost... that will need some coordination to rebuild.... especially if not all friends go to the same world. But with only 5 remaining, there are not much options.
Probably there will be more answers from blue names, the forum is pretty active right now.