The r4i-sdhc 3ds can work on the NDSi v1.44 after updating the firmware to the latest version v1.55b. Please notice that it's just for R4i-SDHC 3DS,but not other r4i-sdhc.Don't worry, the r4i-sdhc team will release others soon.
No, R4i sdhc 3ds can not work on my DSi V1.44, i even can not uodate it with V1.55b because there is no update icon this time. there must be something wrong about the official news.