Exactly that.
庵野監督は「(自分は)50代半ばで、宮さん(宮崎駿監督)が『もののけ姫』を作ったころ。働き盛りです。新しいものも進めている。働きますよ!」と力強く語った。
Sorta liberal translation, emphasis mine:
Director Anno said forcefully: "I'm in my mid-fifties, age when Hayao created Mononoke Hime. It is prime of life. A new work is also advancing. I'm working!"
"新しいもの" means literally "new thing".
So yeah, looks like Anno has already a non-eva project ongoing at some stage (probably pre-production). No one knows what exactly it is. Japanese fans immeaditly speculated it is the much talked about Nausicaa project but given other comments about Ghibli's current situation and Anno's current relationship to the studio I find that most unlikely.