http://www.jal.co.jp/en/info/inter/120419.html
Notice of temporary change in aircraft configuration (Narita-Jakarta JL725/726)
The Narita-Jakarta route features the JAL SUITE in First Class and JAL SHELL FLAT NEO seat in Business Class. Due to temporary change in aircraft equipment, the route features the JAL SKYSLEEPER SOLO in First Class and JAL SHELL FLAT seat in Business Class during the period stated below.
Applicable Period: May4 and May8 through May31, 2012(Flight date)
Flight Number:
JL725 (Narita, Japan to Jakarta)
JL726 (Jakarta to Narita, Japan)
We apologize for any inconvenience this may cause our valued customers.
April 19, 2012
Japan Airlines
Hopeful thinking on my part that they are installing inflight wi-fi but most likely it's just one of those regular maintenance