Unless there's an official announcement (in writing, at an event, by Musk, on the website, ...), any information provided by Tesla staff has generally been unreliable - while Tesla staff try to be helpful, they may provide their personal opinion on what's going to happen - and not the official plans.
Except for new vehicle reveals (which are typically done 1-2 years prior to production), Tesla usually doesn't announce model changes until they are ready to put them into production. Even though this introduces some challenges in dealing with customers who've recently purchased vehicles or have vehicles on order, this strategy has avoided the cycles the other manufacturers see when customers hold off until a new model year.
Battery Day may or may not live up to hype. If they are announcing any S/3/X/Y model changes, those will likely be introduced immediately into production - unless it's for a specialized version - such as a very high-end ultra performance model, that could be months away from production - and pre-announcing that would have minimal impact on Tesla's near term sales.
Except for new vehicle reveals (which are typically done 1-2 years prior to production), Tesla usually doesn't announce model changes until they are ready to put them into production. Even though this introduces some challenges in dealing with customers who've recently purchased vehicles or have vehicles on order, this strategy has avoided the cycles the other manufacturers see when customers hold off until a new model year.
Battery Day may or may not live up to hype. If they are announcing any S/3/X/Y model changes, those will likely be introduced immediately into production - unless it's for a specialized version - such as a very high-end ultra performance model, that could be months away from production - and pre-announcing that would have minimal impact on Tesla's near term sales.