Bing is no longer exclusive to Verizon Android devices
We shouldn't be surprised that Bing has become more widely available. Search engine's like Bing thrive on advertising revenue, and it wouldn't be in their best interest to stick with Verizon. Besides, Verizon wouldn't want to pay them to retain such exclusivity. It seems they've enjoyed their symbiotic relationship long enough: Verizon's Android devices were differentiated from others, and Verizon customers got to sample Bing.
The app itself remains unchanged, and Verizon will still include it with some of their devices. Bing still offers maps and voice commands comparable to Google's, but many users will avoid Bing. We can't blame you; you've fallen in love with Google, and you haven't been sufficiently motivated to switch camps. C'est la vie, Microsoft.