The Ausdroid Shop has all your Nexus accessories here.

According to the Asus Australia Facebook page they are giving an eta of July for both the Padfone and the TF700 tablet. The Padfone is the dual purpose device that allows you to dock your phone into a Tablet shell to allow you to work on a larger screen when required with the additional functionality of a keyboard dock added as well. The TF700 is the Tegra 3 packing tablet with the full HD Screen which offers a resolution of 1920×1200 @ 224ppi.
On the TF700 :

thanks for your interest, TF700 is expected to arrive around July time frame, we’ll keep everyone update when more information becomes available, stay tuned. Thanks!

The Padfone :

PadFone is expected to arrive in July time frame. thanks

No info on retailers although you’d expect to see them at the same places you normally see Asus products. Pricing remains the biggest point of interest with both devices, the TF700 with its HD screen will be interesting to see at what price-point Asus intend to market this tablet. The Padfone is another kettle of fish entirely, what is most needed is the individual pricing of all the accessories.

As usual we’ll update as soon as further information comes to hand. Anyone after the TF700 or the Padfone? If so are you willing to wait till July or is it time to import?

Source: Asus Australia Facebook page.
Companies: ASUS