I'm very interested in ordering tonight...some questions...
1) Will I be able to run a lightning node like Umbrel on this machine?
2) What applications can be run on the computer, is it like a full computer (it has Linux) and can it run everything?
3) What is the profitability per day if pool mining?
1) The full version includes the miner and a small computer (think something like a raspberry pi, but more powerful). There is a bitcoin node installed there, and I think they're still working on adding lightning on top of it. It would be a software update anyway. And of course you can just install anything there, it's a linux machine.
2) Yes, it's a linux device(if you buy the full version), you get full access to it. Note that the standard version includes just the miner, no computer. So if you get the standard you'll have to connect it through USB to a computer. Also note the miner software is closed sourced, but there are binaries for Raspberry Pi, Linux, and Windows.
3) This depends of course on how you configure it. It can get up to 3TH/s+. Any online calculator should give you the details when plugging this number. For quiet operation it gets around 2-2.5TH/s.