Good news! A few minutes ago I just receive this intermediary OTA update for my Acer A1-810 tablet.
Android Version: Jelly Bean 4.2.2
Kernel version: 3.4.5
Image version: Acer_AV052_A1-810_RV31RC03_WW_GEN1
Build number: Acer_AV052_A1-810_1.131.00_WW_GEN1
Country: Roumania
Android Version: Jelly Bean 4.2.2
Kernel version: 3.4.5
Image version: Acer_AV052_A1-810_RV31RC03_WW_GEN1
Build number: Acer_AV052_A1-810_1.131.00_WW_GEN1
Country: Roumania
[Update] It looks like some german / dutch lucky guys already got the KitKat update. In addition to the optical adjustments in Android 4.4 KitKat, like the white icons in the notification bar, the new firmware brings Android 4.4 with all the internal changes and security updates with it. In addition, Acer indicates that the camera application of the tablet has been improved. During the update, all data will be available on the tablet. Acer let us know that Google has changed the memory logic with Android 4.4.2 and outsource data on the external SD card now controls differently.
Kernel version: 3.4.67
Image version: Acer_AV0K0_A1-810_RV0BRC01_WW_GEN1
Build number: Acer_AV0K0_A1-810_1.029.00_WW_GEN1
Country: Germany
Read more here or here.