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The trademark doesn't mention the mooted Game Boy Classic by name, but as noted by Gears of Biz, instead covers a variety of merchandising opportunities employing the Game Boy brand including wallets, bags, pouches, clothing, umbrellas and more. So if nothing else, some cool Nintendo swag is probably on its way.
However, the filing also covers programmes and storage "home video game machines' and "portable electronic game machines", hinting that some kind of console could be on the way.
Reviving the Game Boy would be a no-brainer for Nintendo too, especially as 2019 will mark the 30th anniversary of the handheld console. The original Game Boy came out in Japan on 21 April 1989 and began selling in Europe a year later on 28 September 1990.