Steve Jobs would often appear to be ending a press conference before uttering “there’s just one more thing” and unveiling a major new product to the masses. Of course, Jobs didn’t invent the expression, but it’s most heavily associated with him
There’s no telling what Swatch will use the trademark for. Maybe it just wants keep Apple from using the phrase. Or maybe it plans to troll the company with a future ad campaign, given the Apple Watch is often seen as a threat to the Swatch’s traditional watch market (even if it probably won’t kill it off).
Either way, Apple likely isn’t too happy about either of the trademarks, but considering neither of those expressions are often used by the company anymore, it’s probably no big harm.