I just upgraded Kubuntu 14.04 -> 14.10 and my Apple Wireless keyboard and Mouse battery indicatores do show up again (command line and KDE widgets):

$ upower -i /org/freedesktop/UPower/devices/battery_hid_90o84o0doffo70oc2_battery
  native-path:          hid-90:84:0d:ff:70:c2-battery                                                             
  model:                Apple Wireless Keyboard                                                                   
  power supply:         no                                                                                        
  updated:              Sa 01 Nov 2014 20:25:15 CET (8 seconds ago)                                               
  has history:          yes                                                                                       
  has statistics:       yes                                                                                          
  battery                                                                                                            
    present:             yes                                                                                         
    rechargeable:        yes                                                                                           
    state:               discharging                                                                                   
    energy:              0 Wh                                                                                             
    energy-empty:        0 Wh                                                                                             
    energy-full:         0 Wh                                                                                                
    energy-full-design:  0 Wh                                                                                                
    energy-rate:         0 W                                                                                                 
    percentage:          71%                                                                                                   
    capacity:            100%                                                                                                  

$ upower -i /org/freedesktop/UPower/devices/battery_hid_7co6do62of1oefob1_battery 
  native-path:          hid-7c:6d:62:f1:ef:b1-battery
  model:                tobias’s mouse
  power supply:         no
  updated:              Sa 01 Nov 2014 20:25:15 CET (23 seconds ago)
  has history:          yes
  has statistics:       yes
  battery
    present:             yes
    rechargeable:        yes
    state:               discharging
    energy:              0 Wh
    energy-empty:        0 Wh
    energy-full:         0 Wh
    energy-full-design:  0 Wh
    energy-rate:         0 W
    percentage:          78%
    capacity:            100%

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 14.10
Release:        14.10
Codename:       utopic
$ uname -a
Linux thinktank 3.16.0-24-generic #32-Ubuntu SMP Tue Oct 28 13:07:32 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Maybe some others can confirm my observation.

Howevver I'm not sure whether it has been a regression in the kernel or an API change which breaks the user-space applications reading those values. As fas as I remember I have been booting into 3.16 und 3.17
http://kernel.ubuntu.com/~kernel-ppa/mainline/
from 14.04 LTS and the issue persisted (read: no battery indicator). This makes me think the reason might be in some ubuntu maintained user-space interface or other kernel module.

BEFORE upgrading to 14.10 make sure to backup your data / installation! On Kubuntu I hit into this issue - which completely breaks your system if you can't help yourself:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1388071