What is the B-3 bomber?

The level of secrecy has been pretty profound.

Officials say the technology is “mature.”

Translation: It has been tested extensively and proven to be reliable.

Officials say the platform is capable of penetrating deep inside the territories of potential adversaries without detection.

Translation: It can penetrate deep into China and Russia without detection.

This raises questions including:

What mature stealth technologies have a proven ability to penetrate deep within China and Russia without detection?

Has the B-2 stealth bomber been flown into China and Russia?  If so, when?

Pretty tantalizing stuff.

http://www.bloomberg.com/news/articles/2015-04-22/air-force-promise-of-affordable-u-s-bomber-finds-few-believers