Saved Custom Content Blocks in Email Template Builder?

Several templates that I would like to start creating are contingent upon a big wishlist feature (saved custom content blocks), which would allow us to create blocks (pre-formatted buttons, event listings, side-by-side content blocks with a placeholder image, etc.) that could easily be dropped into a template while creating newsletters and event promotions.

I tend to use a lot of lorem ipsum blocks in saved templates I clone for creating new emails, but it would make things much easier if I was able to design content blocks and save them in a library to pull into the emails as I’m building them out, rather than to have to recreate all of the formatting every time I build an email.

Is this something that might already be on the roadmap, given the planned implementation of the new email template editor (and the phasing out of the old one)?