Well if AMart is traded it will be this summer, and I think it would be odd if the Kings playoff hero wouldn't even be in the building for the banner raising. I know Bolland was traded last year, but that was because they were up against the cap, the Kings are not up against the cap this season.
If AMart leaves it will be as an UFA after this coming season because DL feels he isn't worth the money he is going to demand. Contending teams like the Kings don't trade quality defenders at the deadline because they are going to leave as an UFA, better to just keep him through the playoffs.