BoB's $90-100 million budget was nothing to sneeze at. One can readily see that most of that money made it onto the screen, largely because mostly "not-yet famous" actors such as Ron Livingston and Damian Lewis were used.
I think BoB--PTO will follow the Marines. It would be a treat to have some naval gunfire support, close air support, and kamikaze action off of some of those islands "filmed" and included. In the ETO, the allies had air superiority but no enemy willing to engage in air carnage against allied targets when losing. The PTO was as different from the ETO as night is to day.
To be credible, the BoB-PTO portrayal should be unblinking in its honesty. As much as it was about anything else, the PTO was a race war. "The Japs" was just the most polite term our side had for them, and they were not any better about the caucasins they fought against or captured.
We didn't take many prisoners because even when the few IJA troops who surrendered tried to, they were rarely captured. On our side, one knew better than to become a POW and to save that last bullet for himself. No one ever told his buddies, "Leave me for the Japs" when on the retreat or something and thought to be too wounded to move. Where else did Americans face bayonet charges and other serious hand-to-hand combat incidents because of the close contact distances jungle fighting can create?
Where was napalm first used? Where were flamethrowers common and used as extensively as any other issued weapon? The atom bomb? There is a nasty undercurrent in the PTO that made that theater qualitatively more savage than the ETO.
BoB does contain a not-so-subtle respect for the enemy's "sameness." A certain respect would be paid by Pacific veterans to their counterparts, but it would be more grounded in an otherworldly toughness, ability to endure hardship and fight suicidally, not out of a shared sense of duty or other, "we could've been friends in a different context" claptrap.
BoB-PTO needs to be more politically incorrect than BoB-ETO or it will ring falsely.