Actually, NO.Most of the benefits of castings and 4680 batteries will be to the company, not so much to the customer.
IMHO the benefits to the Buyer of a MY v2.0 with 4680 + both F+R megacasts:
1. 10% reduced weight - weight buys range, buys handling, buys performance (it's 440lbs, that's a lot)
2. better fit / finish - the castings are more consistently dimensioned vs welded steel pieces, meaning body panel gaps will be more consistent
3. 4680 batteries charge up faster - for those people (only) who do road trips, that's a big benefit.
I believe the primary value of the 4680 battery (to the Buyer) is as an enabler of the structural improvements and weight savings.
Most people seldom do long road trips, but it's nice to be able to when you need to.
But yes, Tesla will be able to build the MY v2.0 faster, in fewer steps, with better QC, and therefore cheaper for them.
Whether MY v2.0 is worth the up-rated price tag compared to v1.0 is eye of the beholder.