IMO, responses to bugs and glitches are much more important than new cars and tracks at the moment.
Looking at previous updates (excluding Christmas and 'emergency' patches) they tend to arrive around 25th to 27th of month.....
So a guess would be around that time with content notification a week or so before......
If as we suspect PD have a monthly schedule for the DLC they will be targeting a specific date each month as needs sign-off etc.
I suspect they won't give more advance notification as want to build anticipation each month and those that do usually are trying to sell a 'season pass'.
To date PD's DLC has .been free - will be interesting to see if that continues for both new cars to GT and any new tracks.......
PD was hiring a community manager (or at least they had the position opened) last year. I sent the job offer to the GTPlanet staff in case they would be interested.
But since then, we've seen absolutely nothing that would lead us to think there's actually someone in charge of building a relationship with the community.
Damn, I would have applied if I knew ! You think my bug report would make a good resume ?
The Communication is realy clear, one update per month for FREE
Like it was clear back in GT6? One update per month and 1 VGT car per month for 24 months.
I see no reason for PD to communicate more than they currently do via the in-game notice board. It tells you what you need to know about each update.