Shaker is classic, especially when not too ornamented (though the type with no beading at all is quite fashionable now so a simple bead is probably more timeless). Simple slab doors, matt, are also pretty trend-proof, and if you have a painted finish (MDF, wood etc) can be re-finished in a few years if you want to. Agree gloss is quite marmite and goes in and out of fashion, it was very in in the 2000s but less so now. Probably best avoided if you want versatility in your kitchen.
Personally I love the wood look and wanted slab/ j-groove wood doors for my kitchen 10 years ago which would still look great now had I actually got them!
Colour-wise, white, grey and navy are dominating the market at the moment. Dark green has been popular over the last 3-4 years but I think the dark look with be dated in about 5 years' time. Unfortunately a side-effect of the Instagram culture is that kitchen and bathroom trends are moving more quickly than they ever used to. It's not great for the environment.
The best advice is to try (it's hard!) to not be swayed by trends and pick a colour you really love, even if that's just white, as your dominant colour. On Pinterest or Instagram or Houzz you will see kitchens in pink (lots of pink), all shades of green, yellow, orange, light blue, deep red... try and find one that makes you go "ooh!".
There's a lot of island-worship around and I think that thing of slapping an attention-grabbing colour on your island and hanging three pendant lights above it will start to look naff before too long, but it's very popular so maybe I'm wrong!
Worktops - hard to go wrong with a natural material (or a quartz version) like marble, concrete or wood (nor in wet areas though!). Our first flat 20 years ago had a white shaker kitchen with a butcher block worktop and tbh that would still look fine now.
Controversially I don't care for the open shelf look that's been dominant over the last few years either; a modest number of wall cupboards, either glazed or light coloured, is easier to clean and hides the Tupperware from public view. No need to have them wall-to-wall though unless you're dealing with very limited storage space.
Hardware: brass still v popular, chrome not cool but so ubiquitous it's classic really, copper quite trendy but if you love it, have it. Nickel is a good shout, if it goes with your cabinet colour(s), as it's never been super on trend so more likely to last.
I wasn't really aware there were big trends in worktop edges, but instinctively I'd go with simple = best. Ornamentation in kitchen fittings is still a way off being in fashion again, though it will come back round eventually!