Probably largely a matter of what we have now, but smaller/lighter/faster.  Handheld computers that are little more than a flexible screen and a battery, for example.
Viable nuclear fusion, hopefully.  There may be a functional prototype power station by that time, capable of indefinitely sustained fusion and generating at least 2GW above input power.  It's not hoverboard stuff - it's due to be working by 2033, they've been working on it since 1970 and they're ahead of schedule.  So it's a very real possibility.
Large improvements in batteries.  There's a lot of money in batteries, so there's a lot of work being done on them, from small ones for handheld devices to massive ones for national grid level power storage.
Largely as a result of the above, practical electric cars on a significant scale.
New medical stuff seems likely:
Lots of more muscular people.  There's a drug being tried on humans right now that shows up to 70% increase in muscle mass in mice without any direct side effects.  It's intended as a treatment for muscular dystrophy, but it's bound to find its way into a wider market.  There are chemical markers animals use that essentially act as a signal to say "that's enough muscle".  All this drug does is gather some of it up, so the signal reaches the cut-off point later.  Hence the apparent lack of side effects.
Medical nanobots.  Seriously.  A couple of months ago researchers managed to devise a way to power them, a crucial step.  They do nothing yet, but they exist in vivo (lab animals).  Probably only very early research stages by 2030, though.
Much more speculatively:  slower aging and a blanket cure for all cancers, courtesy of nature's own collection of ugliness, the naked mole rat.  Lives 6 times as long as expected and is immune to cancer.  Researchers now know why.  Maybe it can be applied to humans, possibly.