The marvel.com article "NYCC 2014: STAR WARS – KANAN: THE LAST PADAWAN" also gives a few tidbits of information about the title from an interview with Wiseman.
"The tone is slightly darker than the television series because it covers an extremely dark time. But from my point of view, nothing has changed, and the tone I’m always going for is that of Episodes IV and V."
"We’ll see Kanan train to be a Jedi. And then we’ll see him train specifically not to be a Jedi anymore. His relationship with Master Billaba is warm and wry." Read More at Marvel.com.