I had plenty of sockets around the worktops in our kitchen, great for all the gadgets, etc, which I get out, use and put away.
I have under cupboard lighting, works for me, and is often the main lighting in the evening, as the light is directed onto the worktop, where the main light is often blocked as someone stands between the light and the worktop.
Having a hob and separate waist level oven has worked well, I had a big range cooker before and got fed up of bending down to use the ovens.
I've found glass splashbacks and wall panels easier to clean than tiling, and no grouting to get manky.
I prefer separate fridges/freezers, so I'm not restricted by the built in options.
I would in a new kitchen have:
More small drawers - a couple of pan drawers and a large cultery drawer doesn't help with storage of small items, eg towels, napkins, placemats, batteries, and many other little bits, I'm currently using baskets on the shelf in one cupboard.
I also like the look of those tall pull-out thin racks, I think they're called larder shelving? I reckon they'd work better than cupboards for dry goods, eg flour, sugar, baking stuff, tinned stuff, etc.
I didn't bother with carousels, etc, in the couple of corner cupboards, just have baskets holding items, as that way you're not losing space to the carousel mechanism.