Price per TB would be the more important measure for this kind of storage equipment.

For reference and to put things in context one has to look at LTO generations. From what I see their invention would fall beyond the LTO-10 standard (unless the market forces and manufacturing change dramatically by then).

https://en.wikipedia.org/wiki/Linear_Tape-Open#Generations

Hard to say. That type of capacity isn't even on the LTO road map yet, and IBM is one of the controlling companies there.

LTO-7 currently holds about 6TB uncompressed, and they're about $100 per cartridge. LTO-8 will double the storage, and will probably be available by the end of next year. I'd guess the cartridges will be more expensive initially, but it's hard to say what the premium will be.