I sent them and e-mail directly asking if their new Katrina formulation will be kept in service from this point on and this was the response.
From Mobile Product Information:
The new Mobil1 motor oil formulation currently is in the process of
being tested for all API requirements and coressponding OEM
specifications as well. The process is long however, Mobil will have
this completed very quickly. This is only a temporary change in
formulation and the previous formulation will be reintroduced onto the
market as supplies become better and without disruption (2-3 months).
Mobil1 engineers that have formulated the synthetic motor oil for the
past 30 years are experts in formulating high performance synthetuc
fluids and are extremely confident that the reformulated product is not
compromising any performance or protection. As always, Mobil stands 100%
behind our product preformance and all consumers can rest assure that
you are using the best all around motor oil in the market.
-Matt