[prewett]

It seems right to me (American speaker). "Released" functions as an adjective, with similar meaning to "available." "Go 1.7 is available" would be grammatically correct.

"Go 1.7 has been released" would also be correct, but uses the present perfect tense.

So the question is, can "released" be used as an adjective? "The released version has a bug" seems correct to me, and "released" clearly functions as an adjective there.

All that said, the present perfect version seems clearly correct, while I can't make a great argument for the adjectival version.

[lobster_johnson]

It's just present tense, usually known as "historical present" tense when used in a headline like this. "Released" here might be intended as an adjective or verb; it's ambiguous, but both are valid in the sentence structure.