According to the website advertising the toys (which is part of the Pokemon Medal Colletion set), the three new pokemons are named Naetoru, Bocchama and Hikozaru
. Since this is an official product site, these names are very likely to be authentic pokemon ones.
From the blog link, the writer has apparently had an exclusive tour to the headquarters of Nintendo, during which he and many other people are given the chance to have hands on experience with D/P and several other games in development.
The three pokemons he mentioned are the starters, since he used the term 'the three which you receive at the beginning'. The first one is a grass plant/dinosaur hybrid, with the face similar to Trapinch
and body similar to Chicorita
. The writer called it a mysterious creature.
The fire type, Hikozaru, is the only one which name the writer knows of, and it is a fire ape. The water type is a penguin like creature. The writer says it is not exactly a penguin, but it's the closest thing he could associate with.
The writer also mentioned that the animation during the healing, in particular how the nurse hands you back your pokeballs and how you place them back into your bag is amazing.
Now, the only common thing between these two links is the fire pokemon Hikozaru, which name probably means Hi (fire) + Ko (child) + Zaru (ape). The name Naetoru is most likely a grass pokemon's name, since Nae means sprout, and toru could be from biitoru (beetle), as the writer mentioned that the grass starter resembled Trapinch's face.
Can't really relate Bocchama is anything right now. Might edit this post later.