If it comes from a Lexus Dealer you will probably receive 12 months warranty.
If it comes from a Motor Trader you will receive the 6 month Statutory Warranty
You will have 7 years left on the Hybrid Battery Warranty, but it must be serviced at Lexus for that to be free. I might be wrong but you may not be able to have the HB checked annually without having the service at the same time.
You will not be able to participate in the Lexus Extended Warranty Scheme as you have exceeded 140,000 miles
Seems a good deal to me as you basically have between 6 and 12 months in which to decide if you want to keep or sell it.
A former member on here (Tony Richa ) clocked up over 200,000 miles trouble free miles in his GS450h.
What is there not to like ?