Frieza died. The Dragon Ball bad guy is supposed to be in hell. But, by the look of this upcoming Dragon Ball Z anime movie poster, Frieza is coming back.
Note that this isn't the first time Frieza has returned to Dragon Ball, but this does look like it could be his most dramatic return.
The title reads Dragon Ball Z: The Resurrection of F (Dragon Ball Z: 復活のF). Note that the word "fukkatsu" (復活) can mean "resurrection", "revival" or "rebirth". The assumption is that "F" refers to "Frieza".
These are two mysterious aliens called Tagoma and Sorbet, who perhaps plan to bring Freiza back? Dragonball creator Akira Toriyama designed both characters.
Dragon Ball Z: The Resurrection of F opens in Japan on April 18, 2015.
新作アニメ映画 「ドラゴンボールZ 復活のF」 が2015年4月18日公開決定！フリーザ、 キタ━━━(゜∀゜)━━━ッ!! [Amaebi] 【速報】ドラゴンボールの最新映画で「フリーザ」復活！次の映画タイトルはドラゴンボールZ 復活の『F』 [Dragon Ball Matome] 1st Key Visual For 2015 Dragon Ball Z Film Reveals Frieza [ANN] V-Jump Unveils New Dragon Ball Z 2015 Movie Title & Date [Kanzenshuu — Thanks Vitas!]