help! there is an icon on a sent message!

[iamviveksri]

till gingerbread i only saw a tick mark on top right of any sent msg indicating it has been delivered. but today [on ics now] i see a orange-yellow colored square where the tick mark used to appear

please tell me what it would indicate?

thanks

 

[iamviveksri]

hey no replies?? please comment!
also is there any way of getting a toast when sms delivery report comes?
thanks