Don't go "oh well". Write to WotC (either through e-mail or in their messageboards) and tell them you'd love to see a 4e version of the Jester. If enough people ask for it, I don't see why they wouldn't pursue it.
The odd thing is, because of the way Essentials characters are set up, with specific mechanics at certain levels, it would have been ridiculously easy to create mechanics for the Thief.
You change the Thief auto-train Stealth to Arcana. Make Backstab into Magic Trick or something that Dazes and does Int mod extra damage. Instead of Skill Mastery at level 2, gain the Ritual Caster feat.
Then make a few Jester utilities (pre-req, Jester only or trained in Arcana works). You can fit the Catch mechanic or scaling walls/acrobatics and magic mechanics at these levels. Everything else works on the Thief really. Done.
It's like they said, "Here's a wealth of ideas we're doing nothing with in celebration of the game!"