It's simultaneously firm and vague. Yes, it does confirm there will be support for pre-Essential classes coming soon. It leaves out any specifics, which makes sense ... they haven't finalized the plans so they can't say for sure when or what will be getting support (and, they probably don't know exactly what articles they will be putting out in say 4 months time, so any commitment like that would be silly and bound to come back and bite them).
Still, the commitment that at some point in the future there will be some kind of specific pre-Essential support, while promising, is still covering their butts by not getting too specific. Still, it's probably as clear as they can be ... more specific and they are making promises they may not be able to keep, and lying (or failing to keep a promise) would be worse in the long run than dodging the question, and this answer at least hewed the line to be direct without overpromising.