The elite level 36 helm is indeed stashable (because we don't want to force people to fill up their inventory with items they may or may not use in the future - like when the level cap is 50 or 60, ya know?). However, it will never become tradeable.

As for a date of the release, we don't do dates. They tend to slide one way or another. We do however, work hard to give our players as much of a head's up as possible when new stuff is coming. This thread is an example of that