Side note: http://www.bay12games.com/dwarves/dev.html seems to be missing some of the latest updates - a lot of the stuff that was added in 0.42.01 is still marked as "partially done" even though the descriptions match what I've seen ingame.
As far as I can see, none of the "partially done items" in the Tavern section are fully done, with maybe one exception -
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Fortress guests include merchants, diplomats, adventurers, mercenaries, bandits, travelers, etc. - Merchants aren't among the guests, and I suspect several types of travelers aren't either (for example people traveling to marry or take on positions elsewhere).
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Rooms rentable to outsiders - Technically, the rooms are rented, but the rooms are only rented to residents, not all travelers (and you get no monetary benefit, of course).
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Fortress's reputation as inn/tavern tracked - There's some kind of reputation, clearly, but as far as I'm aware, the plans were a bit farther-reaching, and depended a bit on recipes and drink quality.
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Tie-ins with fortress justice if things go badly - That's not happening right now, I'm pretty sure.
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Inns in some towns and on roads, with rooms available for the player - No road-side inns.
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Food and drink service for the player and others - There are only drink services.