Nokia's sales chief Chris Weber has taken to Twitter directly calling out Samsung. Of its upcoming Windows Phone 8 handsets due to be unveiled on September 5, Weber tweeted, "Samsung take note, next generation Lumia coming soon." With the Finnish handset maker struggling to gain traction with its current Windows Phone 7 line up, Weber could either be trying to build hype, or could be very confident that Nokia has got it right with its latest smartphones.