Unfortunately, new physics doesn't necessarily mean new/fixed tyre heating behaviour. It would be nice to have, but I wouldn't bet on it.
Regarding the wear-grip relation, judging from hearsay I thought that at least brand new tyres are often very grippy for the first few laps and then quickly degrade before plateauing at a slightly lower grip level, but I could be imagining things. It is, however, certain that the tyre wear/heat/grip correlation is a very complicated matter that is influenced by many factors, making a completely accurate simulation with just one base tyre model (that we have in LFS) nigh impossible.