Fishy. I don't trust them at all. I wouldn't be surprised if this was done at the request of the DoJ/State Dept., and they'd agreed to provide details on donors.
It simply is not in the nature of companies like this to say, "sorry guys, our bad. No hard feelings?"
Maybe some hackers can get into Visa and Mastercard and plant something unflattering information, (like big monetary donations to al-queda with trail of evidences leading back to the CEO) so that the government has to launch an investigation and seize Visa and Mastercard's profits. Give them a taste of their own medicine.
I don't know if they did this to try and settle with Wikileaks/Datacell, but they are basically admitting they are guilty for blockading Wikileaks.
If Wikileaks and Datacell can afford it, they should continue with the lawsuit to set an example out of them. The move from today is going to score points in Wikileaks' favor in the court.
After all that everything that happened I am not sure it is such a great idea. If Sony can get into everyone's personal info with pressure just because some people shared a console jailbreak, imagine what can a government do to pressure some credit card companies with an international whitsleblower website.
It simply is not in the nature of companies like this to say, "sorry guys, our bad. No hard feelings?"