Unfortunately we cannot comment on what future release may or may not contain.
my personal view - think the will not integrate Raid 5 in consumer line... maybe for server's ... but there you will rather use external controllers which performs quite better.
for normal consumer raid 0/1 are the most useful.
raid 0 = high read/write performance with no fault tolerance
raid 1 = high read/normal write performance with redundancy
installing (all raid levels)
- plug in all HDD/SDD
- crate raid stripe in the bios
- format HDD/SDD in your OS
- copy data to raid
for basic information read