There's nothing as satisfying as permanently deleting that annoying email. Well, that's not true, there are a lot of things more satisfying than that, like hugging your children, eating a good steak, and landing a headshot on that jerk who's been camping the spawn. But if you've been craving that small, petty, satisfying feeling of quickly deleting hundreds of emails, Google's got your back. The 4.5.2 version of the Gmail app makes the Delete button the default setting after you long-press a message (in the last major revision it was previously set to Archive).
Other changes include the ability to select multiple emails in a chain by touching the sender images, plus the usual bug fixes.