It would behoove them to, though I already bought a hotspot. VVM - never used it before, wouldn't bother paying for it. But they are things that they can make more money from, even if only a part of their customer base, so I'm sure that they will. Maybe not immediately, but I'm betting before too long they will.
I read somewhere yesterday (maybe www.wpcentral.com) that there has to be a specific chipset in the phone to support tethering, and I don't know if the HTC Trophy has that chipset, so I'm not hopeful on thethering.
As far as Visual Voice Mail, not sure, but I've been using a combination of YouMail (www.youmail.com) and MagikMailLite (in the Marketplace) to give me the same features, with no monthly charge. Works pretty well, IMO, and plenty of options for configuration.