Do we know what is going to happen to the ex-LM 150's?
Yes we do. But the information is split over about half a dozen threads started before you joined the forum, so I'll attempt a short summary.
Having been rearranged into their original two car formations, the LM fleet of 150/1 and 150/2 has nearly all been split between FGW and Northern. LM will retain only the 3 x 2 car units as noted above in post #5.
Of the rest, FGW get 11 units, and Northern get 18 units.
The pair of original 3 car units, 150001/2 are currently going off lease, indeed 150002 has been at Eastleigh since the end of October. Lastly there are two orphaned carriages following accidents over the years, these have been joined as 150209, and this unit is also in store at Eastleigh.
None of the Manchester area Pacers will be withdrawn, indeed rather more will be in service following the transfer of 7 x 142s back from FGW.
Also leaving Northern are the 3 x 180s, and 4 x 156s which go to EMT.