This is a BIG news, Pokemon GO Hub has recently discovered an entire Generation II families from the game source code on 0.45.0 APK .

Pokemon like Chikorita, Cyndaquil and Totodile should not be a stranger to you if you have played the game in the older days. 

View Gen II Pokemon metadata

If you are wondering how many NEW Pokemon are adding to Pokemon GO then you will love this. 

Because GEN II has 100 Pokemon!​

Courtesy to Pokemon GO Hub. Here's the list:

IDSpritePokemonMax CP
152Chikorita1024
153Bayleef1554
154Meganium2484
155Cyndaquil955
156Quilava1557
157Typhlosion2602
158Totodile1066
159Croconaw1651
160Feraligatr2678
161Sentret613
162Furret1586
163Hoothoot726
164Noctowl1856
165Ledyba596
166Ledian1136
167Spinarak767
168Ariados1705
169Crobat2348
170Chinchou1094
171Lanturn2154
172Pichu426
173Cleffa599
174Igglybuff612
175Togepi576
176Togetic1450
177Natu1011
178Xatu2019
179Mareep949
180Flaaffy1497
181Ampharos2618
182Bellossom2394
183Marill587
184Azumarill1750
185Sudowoodo1480
186Politoed2460
187Hoppip632
188Skiploom1041
189Jumpluff1607
190Aipom1160
191Sunkern423
192Sunflora2079
193Yanma1471
194Wooper586
195Quagsire2070
196Espeon2252
197Umbreon2311
198Murkrow1622
199Slowking2597
200Misdreavus1708
201Unown1272
202Wobbuffet1380
203Girafarig2015
204Pineco926
205Forretress2039
206Dunsparce1905
207Gligar1432
208Steelix2080
209Snubbull1081
210Granbull2215
211Qwilfish1708
212Scizor2270
213Shuckle395
214Heracross2060
215Sneasel1354
216Teddiursa1267
217Ursaring2648
218Slugma796
219Magcargo1523
220Swinub713
221Piloswine2189
222Corsola1440
223Remoraid931
224Octillery2565
225Delibird1071
226Mantine1650
227Skarmory1650
228Houndour1129
229Houndoom2371
230Kingdra2671
231Phanpy1218
232Donphan2448
233Porygon22653
234Stantler2141
235Smeargle537
236Tyrogue550
237Hitmontop1515
238Smoochum820
239Elekid1166
240Magby1270
241Miltank1917
242Blissey1234
243Raikou2963
244Entei3262
245Suicune2925
246Larvitar1018
247Pupitar1789
248Tyranitar3653
249Lugia3613
250Ho-Oh4213
251Celebi3299

Around the same period Dittio's move code has also been found in the GAME_MASTER file according to TheSilphRoad, which suggests the addition of the Pokemon is not far, so don't give up the game too soon! 

Meanwhile, let's be a little bit more patient with the existing Pokemon. If you like you may check out Singapore Pokemon GO nest list over here.