October 15th was considered as the date when Google will announce the next-generation Nexus 5 and Android 4.4 officially. Unfortunately, the rumour was false, forcing us to think when exactly Google will launch these stuffs officially, and it looks like KitKat is giving some hint for the answer. KitKat is teasing the Android 4.4 on their social media channels from a long time, and after investigating the recent teasers, it came out that Google will officially announce the Android 4.4 on October 28th along with Nexus 5, and doubted Nexus 4 LTE.
Starting with the first tweet which came yesterday from KitKat - "Everybody dance now!", refers to the song "Gonna make you sweet", which was performed by a band called "C+C Music Factory", a group previously known as "The 28th Street Crew" (until 1989).
Then today KitKat tweeted - "Sometimes you have to look at the signs" with a picture of KitKats piled up to say - "This Is It", which refers to the popular Michael Jackson movie which premiered on October 28th, 2009.
Both these tweets carries the number 28 indirectly, pointing towards October 28th launch. This might be a coincidence, but this does not seems to be a coincidence.
Some think that these are clues from KitKat for us to digg upon. Also, this new date falls perfectly in line with last year's Google announcement of the Nexus 4 that happened on October 29th, as described above.
Thus, it can be confirmed that 28th October is the real date of Nexus 5 and Android 4.4 KitKat announcement, along with rumoured Google Nexus smartwatch and Nexus 4 LTE version.
Coming to Nexus 4 LTE and pricing details now, according to AndroidGeeks blog post, Google will launch the 16GB version of Nexus 5 for $399, and the 32GB for $449. The post further added saying that, the internet search giant will also introduce an LTE model of the Nexus 4, where the 16GB version will cost $299 and 32GB will cost $349. This news can't be confirmed, so it's better to take it with a pinch of salt.
Source - AndroidGeeks, KitKat (1, 2)
Via - Pocket-lint & GSMArena