So CC 215 will finally be upgraded to freeway for its entire length.
I suspect it will spur development of the northwest section of the valley.
Perhaps you meant the *northeast* section of the valley?
The Valley's big housing development boom of the 1990s was majorly focused in the northwest Las Vegas valley, long before the 215 beltway even existed in that part of town. Development in the northwest has continued since (slowed substantially during the recession), but seems that the southwest valley and north/northeast are now seeing much more activity now.
The last remaining non-freeway stretch of 215 (Losee - Pecos - Lamb - just short of Range Road) is currently under conversion to freeway. After that project is done, it will just be the northern system interchanges at US 95 and I-15 that will still need work—I-15 interchange being addressed with this project, and US 95 interchange being addressed in upcoming phases of a different corridor project.