In the US, the M3 RWD has had LFP battery for at least a year. MY RWD in the US is unlikely to have LFP because it's qualified for $7500 tax credit. As far as I know, LFP battery pack are not made in US yet. I have seen posts about Canadian MY RWD with LFP despite being from Fremont. It makes sense since both M3 and MY are designed to fit the same battery pack; if Fremont can build M3 RWD with LFP, then they certainly can build MY RWD with LFP.