？。
Are hidden characters also scheduled to appear? We asked the developer.
Literal
Hidden-character [also-も] appearance schedule? Developer [to-に] ask.
Gaming-journalism style. The first half is a headline-style fragment (~予定?) with the question mark carrying the full interrogative weight. 隠しキャラ ('hidden character') uses the truncated キャラ from キャラクター (character) — this clipping is standard in casual/gaming speech. 登場予定 ('scheduled appearance,' 'planned to appear') is a compound: 登場 (appearance, showing up) + 予定 (schedule, plan). The second sentence 開発元に聞く ('ask the developer') is another terse fragment typical of gaming-news prose. 開発元 ('developer,' literally 'development origin') is the studio or company behind a product.