KitKat 4.4 Specs

1. Screen Recording
2. Tap to Pay   {Google Wallet for everyone}
3. NFC emulation for non nfc devices
4. 14% less memory usage
5. Minimum Ram required is 512mb
6. chrome, youtube takes 12%less memory
7. cloud printing from Gallery  {Print your photos directly to ur home Printer}
8. Webview is Now Chromium
9. Google Home is the new Launcher 
10. New 'Google Home' works only with Google Search app installed
11. Core System Processes Trimmed
12. Apps are efficient and responsive on all devices
13. The all new 'procstats tool details' memory use 
14. Payments without needing Secure Elements
15. Printer manufacturers can use new APIs to develop their own print services
16. A new storage access framework allows browse all document storage providers.
17. ART runtime compile support along with dalvik VM {faster runtime}
18. Dalvik JIT code cache tuning, kernel samepage merging (KSM), swap to zRAM
19. Use less heap,Aggressively protect system memory from apps
20. When multiple services start at once —Android now launches the services serially
21. hardware sensor batching
22. Step Detector and Step Counter
23. shared SMS provider and new APIs
24. Full-screen Immersive mode
25. Transitions framework for animating scenes {animate changes to your UI on the fly}
26. Translucent system UI styling
27. Enhanced notification access
28. seamless change in resolution during media playback
29. Common Encryption for protected content
30. HTTP Live Streaming
31. Audio Tunneling to DSP dramatically improve battery life
32. Nexus 5 offers a total off-network audio playback time of up to 60 hours
33. Audio monitoring peak and RMS levels of any currently playing audio
34. Loudness enhancer increase the loudness of spoken content
35. Audio timestamps for improved AV sync
36. Wi-Fi CERTIFIED Miracast
37. RenderScript Compute improves Ongoing performance
38. RenderScript in the Android NDK
39. GPU acceleration for any apps using render script
40. GLES2.0 SurfaceFlinger
41. New HWComposer 1.3 support for virtual displays
42. Bluetooth HID over GATT (HOGP) support
43. Bluetooth MAP support
44. built-in IR blasters, along with a new API and system service
45. Wi-Fi TDLS support seamless way to stream media in same wifi network
46. System-wide settings for closed captioning { appscan show captions}
47. SELinux (enforcing mode)
48. Improved cryptographic algorithms ECDSA
49. Designed to run fast, smooth, and responsively on a much broader range of devices than ever before
50. Phone dialer got local business detection
51. Smart caller ID
52. SMS support for Hangout
53. Emoji support on Google keyboard
54. Redigned Quickoffice
55. 100gb Google drive Storage Coming soon
56. Updated Google Apps
57. Faster smoother,brilliant google voice search 
58. swipe left for Google now on Google Home
59. Full Screen AlbumArt on lockscreen
60. Best Android YET......Any Doubts?