Yea so Duc749r and I were talking about this the other day. There weren't Instagram photos popping up from the track day until last week so we wondered if the track days just started. I was told that the invites went in the same sequence as the order placements, but if the track days just started and I am going on the 3rd, that couldn't be true. I actually spoke to Jason Chinnock briefly at an event a few weeks ago and he mentioned that the track days would be going for quite a while because there was a lot of interest.
Anyway, here's the page from the SL site about it. No mention of it being limited.
1299 Superleggera | EXPERIENCE