HTC is collaborating with Japanese telco KDDI to deliver an HTC One variant that allows users to slide in an extra memory card and likely a backup battery for extended operating hours.

To be introduced as the HTC J One, reminiscent of last year's HTC J Butterfly, the handset will start sitting on Japanese store shelves by the first week of June, according to Engadget, packing the same design and power that elicited positive feedbacks from tech experts.

The additional memory would mean a space of another 64GB for the new HTC flagship, which is a feature that Engadget said is already confirmed. No manufacturing issues are expected to delay the rollout as a similar model was previously issued in China.

That same release also offered a removable back cover, suggesting that the Japan-geared HTC One will carry over the feature. With an access to its battery compartment, One owners in Japan and China are given some amount of flexibility - to lug along a fully-charged second battery.

Save for these key modifications, the HTC J One, also to be known by Japanese buyers as HTL22, is essential of the same make and functions of its international sibling, boasting off a quad-core Snapdragon CPU, a mix of the latest Jelly Bean and Sense and a storage serving of 32GB and 64GB.

The news of a possible new HTC One edition came out as speculations swirled that the Taiwan-based mobile device manufacturing could spring a surprise by issuing a version that runs on vanilla Android.

The prospect of owning the One with a Nexus-like features and functions immediately set off excitement among the hardcore Android crowd, who relish the idea of enjoying the raw powers of Android with the impressive hardware specs that HTC deployed with its new flagship.

If ever, a Nexus-based HTC One will directly tussle with the Galaxy S4 Nexus that Google unveiled last week and the Play Store will start selling on June 26 for $US649.