On the right side of the dashboard page near where you can view your images by either # sales or date there's a box where you can sort by price which lets you just see any of your free images.

I think last year they changed it so if you had any free images for the year you had to opt them out or they'd be automatically included. I think this was in December or January - I only had 3 or 4 & now they are all opted out. Anyway, that's how you see them.

I think you are a bit too early for this. Last year the option to nominate images for the free collection became available in mid-August.
No idea whether they will have this offer again this year, but if they do, I wouldn't expect it much earlier than last year. Wouldn't make much sense from Adobe's point of view since they still have the free images from the last batch in their collection till the end of August.