if you're referring to the same thing i'm thinking of, i don't think they are not RRL- or blue label-specific... they're just usually scattered in those sections in-store. i've seen "RL Vintage" pieces from abercrombie, ll bean, and banana republic to name a few.
any idea on quantities? i know they're programmed to say "extremely limited" to entice you to buy, but on the UK site there's no mention that they're L.E. (so there's a chance it will make it to sale).