Not yet. Lineage 1000 is not yet out.
Forgot about that, I know the E-jets aren't Business jets. Everyone is dipping into the business jet market. With large ones too. The BBJs probably started off the (L/XL) Business jet trend with the 737, 747 and 787 style BBJs, Airbus' A319CJ, The Lineage 1000 as you mentioned. Wonder how they cut into the profits of the smaller yet still large G5s and Global Express a/c, though G5s are still very popular.
Whereas CRJ is a business jet - derivative of Canadair Challenger
You mean Challenger is the Business jet derivative of the CRJ.