On a conference call this morning discussing Apple's decision to issue a dividend and buy back $10 billion worth of shares, CEO Tim Cook said the following about iPad sales so far: “We had a record weekend and we’re thrilled with it.” He declined to discuss it further.
Some analysts and pundits over the weekend were arguing that sales were less than anticipated. However, according to AT&T (via CNN) the company said it saw record activations of the 4G iPad on its network:
On Friday, March 16, AT&T set a new single-day record for its iPad sales and activations, demonstrating robust demand for the new iPad on the nation's largest 4G network, covering nearly 250 million people.
We won't know what pre-order and initial weekend sales were unless or until Apple puts out a press release. Given AT&T and Tim Cook's remarks, however, I suspect the company will do so.
Update: And they did a little while ago. Apple said it had sold more than 3 million "new iPads" as of today: "Apple today announced it has sold three million of its incredible new iPad, since its launch on Friday, March 16."