As 43 said this is not exactly new news. It is within the range of a typical ACL return when everything goes right.
I a few more months say late August or early September a much more accurate estimated timeline for his return should be available and this really matters. While 4 weeks may not seem like a lot it does have a big impact on the risk associated with the contract and the size of the contract that makes sense. I have also seen reports that it might me December before he returns.
I am in the camp that we need to better understand the availability of OBJ before signing him to a fair value contract. Now a homer contract that is for less money and reduces risk, for both parties may be in order but it doesn't seem like that is in the cards right now.