I'm still running a 2010 MacBook Pro 15. Still mostly does what I need. About ready to upgrade but want to hold out for some hoped-for changes in future revisions, like a nicer keyboard, and (probably hoping too much here) now that Jony Ive is gone, maybe a little better user serviceability/upgradeability. I'm interested in a monitor that would be a nice complement to a hypothetical new Mac purchased within the next year or so, but also nicely functional with my current MBP as long as I'm using it. I'm thinking maybe something in the range of 4k/32 inches. What do I need to know about 4k monitors and Macs, and particularly about connecting to older Macs? I know that my current MBP can drive no more than 2560x1600. Would a 4k monitor scale acceptably to 2560x1600 (or more likely 2560x1440)? Or at least work well at full HD? Would some be better than others for this?