Respawn Entertainment has confirmed that its free DLC promotion for the 2014 blockbuster shooter Titanfall has no time restrictions, with all three expansions free to download forever.

Titanfall's trio of expansions--Expedition, Frontier's Edge, and IMC Rising--usually cost $10 each in the US and £7 each in the UK.

The announcement to offer the content for free was partly to mark the game's one-year anniversary. Respawn co-founder Vince Zampella has published a blog post thanking fans for their support of Titanfall throughout its first twelve months on the market.

But it was not clear how long the promotion would last, until on Friday, when the game's official Twitter account wrote: "This content is free starting now and will remain free for all users who purchase Titanfall for Xbox One, Xbox 360 and PC."

Titanfall was pitched by Microsoft as one of the Xbox One's first major console exclusives. GameSpot's Titanfall review was laced with praise, describing Respawn's debut shooter as "a game that combines the vibrant and new with the tried and true to create something special."

On Thursday, Zampella also confirmed that his team is now working on the Titanfall 2 project.

"I guess EA announced a sequel, so I could play coy and pretend I don't know anything about it, or… yeah. So we're working on a sequel," he said.

"No official name yet, but we're working on that. That's the main focus but we're starting up a second team and doing some smaller stuff too. Small, exploratory, taking it slow! It'll be multiplatform."

It means that the successor to Titanfall will almost certainly ship on PlayStation 4 as well as Xbox One, and likely on PC too. The original launched as an Xbox console exclusive.

Zampella, who is credited with helping shape the Modern Warfare series when he headed up Infinity ward, appeared to be unsure about whether the sequel will introduce a more robust single-player campaign.

"I wouldn't have done it differently," Zampella said reflecting on original's multiplayer-only approach.

"I think that's a fantastic way to do it," he said. "I think having the maps like that in packs, it does split the community and it makes it harder for matchmaking, it's messy. Yeah. I don't know we won't do it again, I can't say that for sure, but the idea would be to do something different."