From reading the thread - are people having different issues with the microphone or the same issues?
As a test - I just tried the front panel mic and headphone (using a Sennheiser headset) - and did a test call within Skype and, from my perspective, it worked well.
I haven't tried using the rear panel though.
I am still running BIOS version 0804.
Running Windows 7 Professional (64-bit).
According to Windows (under Device Manager -> Sound, video and game controllers -> Realtek High Definition Audio) I am running:
Driver: Realtek Semiconductor Corp.
Driver Date: 21/08/2013
Driver Version: 220.127.116.1123
MOTHERBOARD: ASUS Maximus VI Formula (BIOS 0804)
CPU: Intel i5-4670k
HDD 1: Samsung SSD 250G 840BW EVO
HDD 2: Western Digital WD10EZEX 1TB Caviar Blue 7200rpm
RAM: 16gb (2x8) G. Skill RipJawsX DDR3-2133
PSU: Seasonic X-Series 750W 80 Plus Gold
GPU: Gigabyte GV-N770OC-4GD
CASE: Fractal Design Define R4
OPTICAL DRIVE: Pioneer BDR-209DBK
MONITOR: Samsung S24C300HL; BenQ E2200HD
OS: Windows 10 Professional
Other: MS Wired 600; Logitech MX 310; Sennheiser PC 151 & Logitech Z150