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[on:]

Are there details anywhere of the changes to the board for R2?

[Reply #1 on:]

I didn't find any 'official info' about R2; even most distributors don't know they are selling two different revisions of Arduino Uno.

But as I said yesterday, R2 has the changes introduced in 'Uno SMD':
- ICSP connector for the 8U2 chip
- Pulldown resistor included for DFU programming of 8U2

[Reply #2 on:]

They really do seem to be getting slack with documentation and releasing things without telling people what the changes are or that new products have actually come out.

[Reply #3 on:]

On May 12 when I received my new Arduino board, I sent a response to distribution asking about changes to the new board layout.  Here is the first response I got:
---------------1-------------------
Hi,

you have sent a distribution request to Arduino.cc. We have got your
email and will be answering you regarding your request.

/Arduino Team
------------end 1------------------
This was followed by a second response which included a phot of the updated board:
----------------2-------------------
Your mail to 'distribution' with the subject

    Updated UNO board

Is being held until the list moderator can review it for approval.

The reason it is being held:

    Message body is too big: 284450 bytes with a limit of 80 KB

Either the message will get posted to the list, or you will receive
notification of the moderator's decision.  If you would like to cancel
this posting, please visit the following URL:
--------------end 2--------------------------
I have received no further feedback and have not seen this posting.  Attached is the photo of the board.

[Reply #4 on:]

Go to 8U2 Firmware Upgrade

      http://arduino.cc/forum/index.php/topic,61100.0.html

for more information.  The photo there matches my board. 

[Reply #5 on:]

Correction:

Arduino UNO R2 8u2 Reprograming

has the photos and discussion.